Au Grade Modeling And Metallogenic Prognosis Of Ore Deposit Scale Based On Geostatistics

The Zaozigou gold deposit is one of the large gold deposit,found in Western West Qinling Mountains,located in the West Qinling Mountains orogenic belt in northern and central parts of bruchfalten crack transition between rift trough.The geological prospecting work in the past has made good progress,but with the mining year by year,the Zaozigou gold deposit has entered the ranks of serious crisis mines.How to evaluate the exploration potential of the deep and the periphery of the early Zi Gou Gold Mine is becoming more and more serious,it is urgent to realize the reservoir of the Zaozigou gold deposit.In this paper,the author collected the Zaozigou gold deposit geological data,establishes the mining geological information database,database of drill hole data and 3D geological model.The location rules of ore bodies in the mining area are summarized.With the aid of geo statistics method,this paper mainly studies the spatial enrichment regularity of gold grade and the structural characteristics of metallogenic system.According to the prediction model,this paper completed the Zaozigou gold prospecting target selection and delineation.The research results of this paper have important reference value for the prediction of ore prospecting in this area,the main achievements and knowledge are:(1)This paper collected all kinds of geological data in Zaozigou mining area,establish mining geo-information database and borehole database.On the basis of fully understanding the geological background of the mining area,with the application of 3D visualization technology in Go CAD software environment to build3 D geological model of mining area,including DTM model,rock mass model,structure model,ore body model,roadway model and drilling model.Analysis the Zaozigou orebody of the general law of output,orebody lateral V characteristics,vertical to the mineralization characteristics and ore body like characteristic spacing,and analyses the ore bearing lower limit in the mining area,and summarizes the Zaozigou orebody location rule.(2)According to the theory of Geostatistics,the spatial variation characteristics of Au grade data of drilling samples and Au grade data of roadway samples were analyzed respectively,the variation function models are established respectively to analyze the regularity of ore fluid migration and accumulation and the structural characteristics in the space of metallogenic system.In Go CAD software,ordinary Kriging interpolation method is used for simulation of valuation.(3)According to the metallogenic model and geological data in the study area,the prediction model is established.Prediction method based on 3D visualization of quantitative prediction model and the trend surface analysis method combining the deep orebody in Zaozigou mining area is proposed.Spatial overlay analysis of favorable factors for ore finding in three dimensional geological model,and comprehensive grade model and orebody location rules,delineation of ore prospecting target area.